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//===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
#include "DebugLocStream.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Support/Debug.h"
namespace llvm {
class AsmPrinter;
/// A single location or constant.
class DbgValueLoc {
/// Any complex address location expression for this DbgValueLoc.
const DIExpression *Expression;
/// Type of entry that this represents.
enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
enum EntryType EntryKind;
/// Either a constant,
union {
int64_t Int;
const ConstantFP *CFP;
const ConstantInt *CIP;
} Constant;
/// Or a location in the machine frame.
MachineLocation Loc;
public:
DbgValueLoc(const DIExpression *Expr, int64_t i)
: Expression(Expr), EntryKind(E_Integer) {
Constant.Int = i;
}
DbgValueLoc(const DIExpression *Expr, const ConstantFP *CFP)
: Expression(Expr), EntryKind(E_ConstantFP) {
Constant.CFP = CFP;
}
DbgValueLoc(const DIExpression *Expr, const ConstantInt *CIP)
: Expression(Expr), EntryKind(E_ConstantInt) {
Constant.CIP = CIP;
}
DbgValueLoc(const DIExpression *Expr, MachineLocation Loc)
: Expression(Expr), EntryKind(E_Location), Loc(Loc) {
assert(cast<DIExpression>(Expr)->isValid());
}
bool isLocation() const { return EntryKind == E_Location; }
bool isInt() const { return EntryKind == E_Integer; }
bool isConstantFP() const { return EntryKind == E_ConstantFP; }
bool isConstantInt() const { return EntryKind == E_ConstantInt; }
int64_t getInt() const { return Constant.Int; }
const ConstantFP *getConstantFP() const { return Constant.CFP; }
const ConstantInt *getConstantInt() const { return Constant.CIP; }
MachineLocation getLoc() const { return Loc; }
bool isFragment() const { return getExpression()->isFragment(); }
bool isEntryVal() const { return getExpression()->isEntryValue(); }
const DIExpression *getExpression() const { return Expression; }
friend bool operator==(const DbgValueLoc &, const DbgValueLoc &);
friend bool operator<(const DbgValueLoc &, const DbgValueLoc &);
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void dump() const {
if (isLocation()) {
llvm::dbgs() << "Loc = { reg=" << Loc.getReg() << " ";
if (Loc.isIndirect())
llvm::dbgs() << "+0";
llvm::dbgs() << "} ";
} else if (isConstantInt())
Constant.CIP->dump();
else if (isConstantFP())
Constant.CFP->dump();
if (Expression)
Expression->dump();
}
#endif
};
/// This struct describes location entries emitted in the .debug_loc
/// section.
class DebugLocEntry {
/// Begin and end symbols for the address range that this location is valid.
const MCSymbol *Begin;
const MCSymbol *End;
/// A nonempty list of locations/constants belonging to this entry,
/// sorted by offset.
SmallVector<DbgValueLoc, 1> Values;
public:
/// Create a location list entry for the range [\p Begin, \p End).
///
/// \param Vals One or more values describing (parts of) the variable.
DebugLocEntry(const MCSymbol *Begin, const MCSymbol *End,
ArrayRef<DbgValueLoc> Vals)
: Begin(Begin), End(End) {
addValues(Vals);
}
/// Attempt to merge this DebugLocEntry with Next and return
/// true if the merge was successful. Entries can be merged if they
/// share the same Loc/Constant and if Next immediately follows this
/// Entry.
bool MergeRanges(const DebugLocEntry &Next) {
// If this and Next are describing the same variable, merge them.
if ((End == Next.Begin && Values == Next.Values)) {
End = Next.End;
return true;
}
return false;
}
const MCSymbol *getBeginSym() const { return Begin; }
const MCSymbol *getEndSym() const { return End; }
ArrayRef<DbgValueLoc> getValues() const { return Values; }
void addValues(ArrayRef<DbgValueLoc> Vals) {
Values.append(Vals.begin(), Vals.end());
sortUniqueValues();
assert((Values.size() == 1 || all_of(Values, [](DbgValueLoc V) {
return V.isFragment();
})) && "must either have a single value or multiple pieces");
}
// Sort the pieces by offset.
// Remove any duplicate entries by dropping all but the first.
void sortUniqueValues() {
llvm::sort(Values);
Values.erase(std::unique(Values.begin(), Values.end(),
[](const DbgValueLoc &A, const DbgValueLoc &B) {
return A.getExpression() == B.getExpression();
}),
Values.end());
}
/// Lower this entry into a DWARF expression.
void finalize(const AsmPrinter &AP,
DebugLocStream::ListBuilder &List,
const DIBasicType *BT,
DwarfCompileUnit &TheCU);
};
/// Compare two DbgValueLocs for equality.
inline bool operator==(const DbgValueLoc &A,
const DbgValueLoc &B) {
if (A.EntryKind != B.EntryKind)
return false;
if (A.Expression != B.Expression)
return false;
switch (A.EntryKind) {
case DbgValueLoc::E_Location:
return A.Loc == B.Loc;
case DbgValueLoc::E_Integer:
return A.Constant.Int == B.Constant.Int;
case DbgValueLoc::E_ConstantFP:
return A.Constant.CFP == B.Constant.CFP;
case DbgValueLoc::E_ConstantInt:
return A.Constant.CIP == B.Constant.CIP;
}
llvm_unreachable("unhandled EntryKind");
}
/// Compare two fragments based on their offset.
inline bool operator<(const DbgValueLoc &A,
const DbgValueLoc &B) {
return A.getExpression()->getFragmentInfo()->OffsetInBits <
B.getExpression()->getFragmentInfo()->OffsetInBits;
}
}
#endif
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